Cascaded Oil Filter Segmentation for Purity and Maintenance
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Solution Overview
Problem
Existing suction oil filter devices have limitations in filtration performance at high viscosity oils and low temperatures, requiring frequent maintenance and high manufacturing precision, while pressure oil filter devices face high dirt impingement and frequent filter medium replacement.
Innovation Solution
The suction oil filter device incorporates a fine filter medium and an ultrafine filter medium in a cascaded filtration configuration, where the ultrafine medium is supported by the fine medium in the secondary flow area, reducing manufacturing complexity and increasing filtration performance without additional retainers, and is designed with inside-outside or outside-inside flow schemes to enhance oil flow and filtration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suction oil filter device is used with high filtration performance, then oil purity is improved, but maintenance effort increases due to frequent filter medium replacement
Solution Approach 1:
The filter device is divided into two independent filter media: a fine filter medium and an ultrafine filter medium. The fine filter medium handles the bulk filtration, while the ultrafine filter medium provides enhanced filtration only for the secondary flow portion. This segmentation allows the system to achieve high oil purity without requiring the entire filter medium to be replaced frequently, as only the ultrafine portion needs maintenance.
Solution Approach 2:
Different filtration qualities are applied to different flow regions. The fine filter medium is positioned to handle the main oil flow with standard filtration, while the ultrafine filter medium is positioned to handle only the secondary flow (typically 10-30% of total flow) with enhanced filtration. This local quality approach achieves high overall filtration performance without the maintenance burden of filtering 100% of oil through ultrafine media.
2Reliability
If a pressure oil filter device is used with high filter performance, then oil purity is improved, but filter medium replacement frequency increases due to high dirt impingement
Solution Approach 1:
The filtration task is segmented between two media with different capabilities. The fine filter medium absorbs the majority of dirt impingement from the main oil flow, while the ultrafine filter medium handles only the secondary flow. This segmentation significantly reduces dirt accumulation on the ultrafine medium, extending its service life and reducing replacement frequency.
Solution Approach 2:
Instead of filtering 100% of oil through ultrafine media (excessive action), the system uses ultrafine media to filter only a partial portion (10-30%) of the oil flow. This partial action achieves high filtration performance for the critical secondary flow while dramatically reducing the total dirt impingement on the ultrafine filter medium, thereby extending its service life.
3Ease of manufacture
If a suction oil filter device is used with simple construction, then manufacturing cost is reduced, but filtration performance decreases at high viscosity and low temperature
Solution Approach 1:
The filter device uses two distinct filter media positioned in different flow regions. The fine filter medium handles the main flow path, ensuring adequate filtration even at high viscosity and low temperature. The ultrafine filter medium enhances filtration for the secondary flow. This segmentation allows the use of simpler, more manufacturable components while maintaining reliable filtration performance across varying operating conditions.
Solution Approach 2:
The system changes the flow parameters by creating a secondary flow region where a portion of the oil (10-30%) is directed through the ultrafine filter medium. This parameter change allows the majority of oil to pass through the simpler fine filter medium, maintaining manufacturing simplicity, while the modified flow path ensures sufficient filtration performance even under challenging conditions of high viscosity and low temperature.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves higher filtration performance and extends the service life of pressure oil filter devices, reducing maintenance effort and maintaining low manufacturing outlay, with improved filtration efficiency at varying oil viscosities and temperatures.
Implementation Method 1
a suction oil pump being connectable to the oil outlet, using which a partial vacuum may be generated between oil inlet and oil outlet
Implementation Method 2
the fine filter medium and an ultrafine filter medium, which are situated between the oil inlet and the oil outlet
Data Source
AI summary
The present invention provides a suction oil filter device for an engine or a transmission that has an oil inlet and an oil outlet on the filter housing, a suction oil pump connectable to the oil outlet, using which a partial vacuum may be generated between oil inlet and oil outlet, a fine filter medium and an ultrafine filter medium, which are situated between the oil inlet and the oil outlet. The fine filter medium is attached to the oil inlet or to the oil outlet, and the ultrafine filter medium is situated before the fine filter medium in the flow direction and in a secondary flow area of the filter housing. A high filtration performance may thus be achieved at low production outlay.